Screwed up Render Settings
Hard to tell from far away.
Try the funnel in the top right corner and enable &quot;Disable in renders&quot;.

That way you can check your collections, whether they are enabled for rendering or not.
I've set my collection &quot;DONT-RENDER&quot; to &quot;disable in renders&quot;. So, the red cube is shown in the viewport but &quot;missing&quot; in final render.